Water Recovery / Reuse

Seven Seas Water follows a practical, environmentally sound approach in treating and reusing wastewater for irrigation, flushing and industrial purposes. From point-of-use planning and management to facility reuse design and permitting, our experienced engineering team can assist in your planning to maximize the often overlooked and valuable resource of wastewater.

DISSOLVED AIR FLOTATION

Dissolved Air Flotation- is a water treatment process which removes suspended matter such as oil or solids. The removal is achieved by dissolving air in the water or wastewater under pressure and then releasing the air at atmospheric pressure in a flotation tank or basin. The released air forms tiny bubbles, which adhere to the suspended matter causing the suspended matter to float to the surface of the water where it may then be removed by a skimming device.  Dissolved air flotation is very widely used in treating the industrial wastewater effluents from oil refineries, petrochemical and chemical plants, natural gas processing plants, paper mills, general water treatment and similar industrial facilities. 

MICRO FILTRATION / ULTRA FILTRATION

Micro filtration is a size-exclusion, pressure-driven membrane process.  This technology uses microporous membranes, which can remove contaminants ranging from 0.1 to 10 μm.  Microfiltration provides an effective barrier for particles, bacteria, and protozoan cysts.  Operating pressures range from 5 to 30 psi. 

Ultra filtration is also a size-exclusion, pressure-driven membrane process.  Compared to micro filtration, UF retains much smaller particles.  Molecules greater than the nominal pore size or nominal molecular weight cutoff (MWCO) are retained.   Most UF systems range from 80k to 100k MWCO.  This type of water treatment typically targets particulates, bacteria, protozoa, viruses, and organic molecules.   Operating pressures range from 10 to 50 psi.

NANO FILTRATION

Nano filtration is also a membrane process which retains organic compounds in the range of 200 to 400 Dalton.  Essentially, this comprises all multivalent cations and anions, and a fraction of monovalent species.  NF membranes are often used to soften water, and they effectively remove disinfection by-product (DPB) precursors such as humic acid.  Operating pressures range from 50 to 150 psi.

SEAWATER / BRACKISH WATER REVERSE OSMOSIS

Seawater Reverse Osmosis and Brackish Water Reverse Osmosis are pressure-driven membrane processes.  Hydraulic pressure is used to overcome the feed solution’s osmotic pressure and induces diffusion of pure water referred to as permeate, through a semi-permeable membrane.  The solutes in the feed stream are concentrated during the process and leave the system as concentrated brine, also known as reject.  These systems effectively remove all organic and inorganic constituents, including monovalent species.  Seawater (SWRO) systems compared to brackish water (BWRO) systems are capable of more selective separation of water from other constituents in the feed stream due to higher pressures and smaller membrane pore sizes.  Operating pressures for SWRO range from 750-1000 psi while BWRO ranges from 200-400 psi.    

Team Experience

Water recycling and reuse practices are at the top of the agenda for most big businesses that depend on water today. We understand your need to meet the regulatory compliance guidelines and to stand up to your commitment to corporate social responsibility, so we've built a team that excels at putting wastewater reuse and recycling practices to work for you.  Our custom designs and sophisticated technologies reduce your costs associated with water usage, resulting in a positive impact on your profitability.